Method and apparatus for drying pulp hollow ware



1.1. ELDRIDGE AND G. A. DUNN.

METHOD AND APPARATUS FOR DRYING PULP HOLLOW WARE.

APPLICATION FILED JUNE I2. 1916. RENEWED um 28. 1920.

1 352,404; PatentodSept. 7, 1920.

2 SHEETS-SHEET l- 3 FIE l N VE NTDR! J. J. ELDRIDGE AND G. A. DUNN. METHOD ANDAPPARATUS FOR DRYING PULP HOLLOW WARE.

APPLICATION FILED JUNE I2, 1916. NENEWED JULY 28,1920. 1,352,404.

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UNITED STATES PATENT OFFICE.

J OHN J. ELDRIDGE AND GUY A. DUNN, OF OAKLAND, CALIFORNIA.

METHOD AND APPARATUS FOR DRYING PULP HOLLOW WARE.

Specification of Letters Patent.

Patented Sept. 7, 1920.

Application filed June 12, 1916, Serial No. 103,150. Renewed July 28. 1920. Serial No. 399,638.

To all whom it may concern.

Be it known that we, JOHN J. Ennnmon and GUY A. DUNN, citizens of the United States, residing at Oakland, in thecountyof Alameda and State of California, have invented new and useful Improvements in Methods of and Apparatus for Drying Pulp Hollow Ware, of which the following is a specification.

The present invention relates to improvements in making hollow ware from paper pulp and is an improvement upon that for which application, Serial No. 41,901, for United States Letters Patent was filed July 26th, 1915, b William H. Fulcher. In that application t ere was described a method of drying the pulp body by passing it through heated ovens or chambers. In the present invention there are employed a method and apparatus which are simpler, more effective and uniform inoperation.

In the accompanying drawings, Figure 1 is a broken side view of my invention, certain parts being shown in section; Fig. 2 is a broken front view thereof; Fig. 3 is a broken plan view thereof; Fig. 4 is an enlarged vertical section of a core to which my invention is applied, certain parts being shown in side elevation; Fig. 5 is a horizontal section'on the line 55 of Fig. 4; Fig. 6 is a vertical section of parts of the apparatus shown in Fig. 4.

Referring to the drawing, 1 indicates a standard, on which, with others not shown, is supported a rail 2, upon which can travel a trolley wheel 3 upon a shaft 4, suspended from which shaft is a hanger 6 having curved guide arms 7 extendin into close proximity with the rail 2. aid han er has also, below said arms, .and extending toward said standard, upper and lower bearing members 8, 9, to which are attached by means of screws 11 bearing members 12, 13, formin with the bearing members 8, 9, cylindrlcal bearings. In said bearings are contained flanged tubes 14, threaded on the inside, and in said threaded tubes are screwed tubes 16. Extending vertically through said tubes is a tube 17, around which are secured, by screws 18, carriers 19 having arms 21 which carry contacts 22 which bear a ainst conducting rails 23, secured in holders 24 supported upon said standard, and suitably insulated therefrom,

. as shown at 26. Each carrier is insulated from the tube 17 by'means of cylindrical in-- Fsulation 27 between the tube and the carrier, and is also insulated from adjacent metal spacing sleeves 28, 29, around the tube by washers 31 of insulating material. From each carrier 19 extends a finger 32 which is rounded at the outer end and is engaged by the tapering edge of a spring barrrel 33 slidable in a tubular guideway 34 contained within a recess 36 in the hanger and insulated therefrom by insulating material 37. A coiled spring 38 is contained in each recess 36 and presses outwardly the spring barrel 33, thereby pressing the tapered edge of the spring barrel against the finger 32, and thereby pressing the contact 22 carried by the arm 21 of the carrier against the corresponding conducting rail 23.

Around the threaded lower end of said tube 17 is screwed the upper art of a conical tubular head 41 having a epending central portion 42 around which is screwed a cylinder 43 on the bottom of which is screwed a flanged tube 44. Around the lower end of the head is screwed a collar 46, having an inwardly extending flange 47, between whichflangeand the bottom of the head is secured a flan e 48 extending outwardly from the top 0% a hollow core 49 of sheet metal, preferably of brass or copper. Within said brass or copper core is a hollow body 51 of alundum, which is a very strong insulating material. The body 51 conforms in general to the shape of the core 49, the core itself being of the shape of the interior of the hollow ware which is to be formed, that here shown being articularl adapted to form the interior 0 a pulp milk bottle. Said body is formed on the outer surface with a continuous helical groove 52 adapted to receive a high resistance heating wire 53.

Against one end of said body is fitted a spider 54 and against the other end is fitted a hollow spider 56, the arms of which have outwardly bent ends bearing against the body 51. Said s iders are connected by a central rod 57. ithin the hollow spider 56 is secured a Hubbell receptacle for electric switches. The two ends of the high resistance wire are secured respectively to two terminals of the Hubbell rece tacle. The two terminals of the ca 58 of the receptacle are secured to insulate wires 59, which extend in the hollow tube to the top thereof and are secured respectively to the two contact carriers 19.

Our improved process is as followsz- -The core, surrounded by mold sections, as illustrated and described in said application for United States Letters Patent, descends into a vessel containing wood pulp. Said mold sections are formed with numerous perforations which permit the water to escape. While in said tank the mold sections ress the pulp between the mold sections an the core and retain the pulp therebetween. The core is then raised and the mold sections are removed leaving the pulp upon the core in the form of the hollow vessel desired. The core is then caused to travel, suspended from the rail 21, so that the contacts 22 are in contact with the conducting rails 23. Thereby a current of electricity is passed through the high resistance wire, and .the core is heated to a high temperature, driving off the moisture from the pulp body and especiall from the interior surface thereof.

1. The process of drying a Series of bodies which consists in bodily moving each body in a path parallel with, and adjacent to, electrical conductors and causing electricity to pass from one to the other of said conductors and closely adjacent to each moving body to heat the same.

' 2. The process of drying a series of bodies each formed of moist pulp around a hollow core, which consists in bodily moving each body and core in a path parallel with, and adjacent to, electrical conductors and cansing electricity to pass from one to the other of said conductors and adjacent to the interior surface of each moving hollow core to heat the same.

3. The process of drying bodies formed of moistpulp around a hollow core which consists in moving the core parallel with, and adjacent to, electrical conductors and causing electricity to pass from one to the other asagna of said conductors and adjacent to the interior surface of the hollow core to heat the same.

4. A device for forming pulphollow ware comprising a hollow core of the form of the interior surface of the hollow ware, and a coil of resistance wire within the core and closely adjacent to the surface thereof.

5. device for forming pulp hollow ware comprising a hollow core of theform of the interior surface of the'hollow ware, a body of insulating material within the core and of external form corresponding with that of the core, and a resistance wire around said body.

6. Means for forming pulp hollow ware comprising conductors extending along side, but insulated from, each other, a core of the form of the interior surface of the pulp body, high resistance wires within the core and closely adjacent to the inner surface thereof, contacts electrically connected to the ends of the high resistance wire, means whereby said contacts can be moved parallel with and adjacent to said conductors, and means for pressing said contacts against said conductors. v

7. In a device of the character described, two conductors extending along side each other, a standard for supporting said conductors, a trolley rail supported by said standard, a trolley wheel movable on said trolley rail, a hanger supported from said wheel, a tube having bearings in said hanger, a hollow core suspended from said tube, high resistance wire within the core, conductors connected to the ends of said wire and extending through said tube, rotatable contact carriers on said tube, contacts carried thereby, and means for pressing the contacts against the first-named conductors, the other ends of the last-named conductors being connected to said carriers.

JOHN J. ELDRIDGE. GUY A. DUNN 

